Pentair Mini-Max NT Pool Heater does not get very hot
The heater has worked great until tonight. I normally set the temperature to 98 degrees and it's quite hot. Tonight I had to set it to 104 degrees and it was warm but not hot. The heater is about 4 years old and has never had a problem before, nor has it had any maintenance. Is there a thermocouple or something easy to fix? Also, is there a repair guide I could purchase or download?
Re: Pentair Mini-Max NT Pool Heater does not get very hot
The thermistor is a common failure on this heater. With a setting of 104 and the heater shutting off early, the sensor is bad. If you have a digital display, check the water temp with a thermometer and compare that ot the display. Odds are that they are different. The thermistor plugs into the back of the thermostat board and is a thin whire wire set or thibker yellow wire. The white wire sensors are old and most have fialed by now.
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Either the thermostat board is defective, the temperature sensor is defective or not enough heat is being produced by the heater. . I recommend you call the Pentair technicalsupport at 800-693-0971 and they should be able to help you figure this issueout. I hope this helps.
If this heater has pool mode and spa mode as an option, and you need the water higher than 84 degrees, you must set it to spa mode even if it is a pool. As a regulation, these heaters come pre-set to max out at 84 degrees as a safety feature. However, in spa mode it can reach 104degrees.
Your temp sensors are on the heater, a small tube that slides into the water manifold, usually on the left side. On the remote it will be in one of the pipes coming from the pump or the filter. If it is after the heater you should move it to between the filter and heater. It will be a tube that is in the pipe with a stanless steel clamp holding it in place.
To find out wich one it is you will need to remove the remote from the system by takeing the wires that go to it from the wireing inside the heater and wire nuting the wires in the heater together. If the heater runs normal then it is the sensor for the remote if not it is the sensor for the heater. Let me know how you do and if need be we can get a little more specfic for your system. good luck.
LO is a limit string open. This is what I refer to as a saftey circut. It will peobally be a dirty filter or a plugged up basket. The heater need enough water flow to run or it will overheat and cause damage to the heater. Without enough flow the saftey circut shuts the heater down before this can occur. If it is more than this it is probally time to get a repairman involved. Good luck and remember this is a box full of fire that runs on high voltage.
wow t pool service is just guessing i guess . weel let see do u have a pilot if yes do u hear a click if yes clean t burners if not check 24v at t brown wir e for t gas valve if v replace gas valve if not replace ignition control . do u have any code on t back or t front this help a little.